Prosecutors said the women were working as prostitutes in Santa Ana and Anaheim when Gordon and his alleged accomplice, Franc Cano, picked them up in 2014 and killed them. Both men are registered sex offenders.

"It was an opportunity to sexually assault them. It was an opportunity to terrorize them. It was the opportunity to give them the hell of what the last two or three hours would be," said prosecutor Larry Yellin.

Estepp's body was the only one found. The discovery was made at an Anaheim recycling plant, which led to the other women.

Gordon and Cano wore GPS ankle bracelets at the time. The prosecutor said investigators used that GPS and cellphone data from the victims to link the men to the murders.

As Gordon represented himself in court for the murders, he blamed only Cano for the crimes.

"In no way am I a saint, but I have a conscience," Gordon said in court. "He does not. He's a predator."In his statement, Gordon claimed Cano used both of their phones to create conversations of them plotting the crimes. He also told jurors he believes Cano committed more than just four murders. Cano's trial date has not been set.

In court on Thursday, Gordon testified Estepp was the one victims he had a change of heart about.

"Yes, I changed my mind about killing her, but that doesnt change the fact she's not alive because I (expletive) up," he explained.

Estepp's family said the guilty verdicts provide some closure.

"We believe Jarrae's death was not in vain," cried mother Jodi Estepp. "That the other mothers -- we've got closure today for them."

The penalty phase of the case will be underway on Monday. That will decide whether Gordon will be put to death.